Mechanism for controlling power-driven machines



Aug. 21, 1923. 1,465,393

P. R. GLASS MECHANISM FOR CONTROLLING POWER DRIVEN MACHINES Filed Dec. 17, 1918 17 5 8 Patented Aug. 21 1923.

srsrss PEELEY R. GLASS, GF BROQKLINE, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATIQN, U13 PATTERSON, IJE N JERSEY, A CORPORATION OF NEW "JERSEY.

IVIECHANiSI /i FOE CONTROLLING- POR ER-DRIVEN MACHINES.

Applic ationfiled December 1?, 1218. Serial 1%. 267,182.

the following description, in connection Y with theaccompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the sev eral figures. V

This invention relates to mechanisms for controllingthe operation of power driven.

machines.

Many machines, such as perforating" machines or eyeleting machines, are designed to be run at a maximum eiiective speed tore substantial period of time depending upon the character of the work to. be periormed, the stopping of such a machine being eiieced at the will of the operator. In the use of many such machines the conditions under which they are operated and the character of the work to be performed are frequently such that, so far as these considerations are concerned, the machines may properl be run at speeds so high thatsuddenly stopping the machines at-these speeds would be likely to cause substantial damage. .r rnimportant object of this invention is to provide mechanism for controlling the chine is driven according to'the character of that portion otthe work being operated upon at any particular moment with stopping; mechanism which is inoperative when the parts of the variable speed driving mechanism are positioned to drive the mamined minimum.

pings mechanism can be operated.

chine at a speed in excess oi a predcter- Eaaid parts may be convenientl positioned at the Wlll of the operator or otherwise, in accordance with the V211 \l11f;' speed requirements.

As the speeifl at which ll/ is convenient to obtain power for driving the meclrnisin is diiterent in ditterent locations provision is made. in the illustrated construction, for adi istinr that position of the speed varying: mechanism which will r nder the stopping mechanism :operative or inoperative, in order that the stopping mechanism will not be required to operate when the resulting; speed is high enough to injure the parts upon sudden stopping. This adjustment is also. convenient because it is often desirable. on account or. the class of work being; done. to have the minimum speed oi a, machine less than the safe maximum at which the stop- The novel construction and arrangement of parts of the mechanism by which the aboveqncntioned results are attained constitute other features of the invention which .will be more iiarticularly described hercinafter and pointed out in the claims.

The accompanyingdrawings forming part of this s ccitication illustrate :1 p3eferred embodiment. of the invention.

In the drawings.

Figure l is asectioual elevation of a preferred embodiment of the invention;

Fig. 2 represents a section on line F2-2 of Fig. 1;

Fig. 3 a detail plan 'iew of the pzliliS especially ill tratcd in Fig.

Fig. i represents a section on line ll of Fig. 1. on a l ghtly reduced scale:

Fig. 5 is ojmentar r perspect' 7c 0 f the step and a part oi the clutch. mechanism and A wheel 17 and a pulley 18, which may be considered as disks, are mounted loosely on the shaft, it being unnecessary to 6);: plain in detail the particular mounting of said wheel and pulley. The pulley 18 is adapted to be driven by a belt 19 and along- "side of said pulley is an idle pulley 20. The sides ofthe Wheels 17 and 18 which face eachother are annularly concaved and between said concaved faces two shift-able friction wheels21are mounted, the axes of adjustment of said friction wheels being indicated by dotted lines at 22 in Fig. 1. Each of said friction Wheels, as illustrated in Fig. 6, is jointed to an oscillating stud shaft mounted in a suitable bearing in the upright 16, and each of the oscillating stud shafts is provided with a toothed segment suitable speed changing; gear. I have illus trated the particular form referred to because it is a convenient one for my present purposes.

The arm 24 is connected bya link 25 to the outerend of a lever 26 pivoted at 27 to the upright 16. The purpose of this lever will be presently explained.

Rigidly secured to the shaft 13 is a hub 28, the connection in the present instance be ing effected by means of a pin 29 passing through the hub and shaft. Opposite the inner end ofthe hub 28 are two clutchstuds 30 carried by the hub portion of wheel. 17, the sides of the heads of the studs 30 being flattened as at 31 (Fig. A red 32 which forms the clutch pin is mounted in the hub 28 at one side of and parallel with the axis of the latter. said pin or red be- It has a fla of the rod or pin 32 is a curved dog 34, the middle portion of which is adapted to fit a guideway formed in an enlarged portion of the shaft or to a sleeve secured to the shaft. The details of this feature are not necessary to illustrate fully herein as this portion of the mechanism is similar to 'tha't illustrated and described in Letters Patent No. 1.261.506, granted April 2, 1918 to A. F. Forbes (see Fig. 6 of said patent) The dog 34 has a beveled tip 35 and a shoulder 36 for the same purpose as in said patent, a spring 37 mounted in a socket 38 being confined between the bottom of said socket and a pin 39 projecting from rod 32 said spring normally tending to slide 'well-known in this type of variable d.

provi ded with a the clutch dog 34 toward the adjacent face of the hub 28 and cause the endof clutch pin 32 to project between the heads of the studs 30 in the hub of wheel 17. i

Abracket 40 attached toer integral with frame 14 (Figs. 1 and 2) is bored to form a guide for a vertical pin 41 adapted to. be operated-by a suitable treadle {(not shon 'n) the upper end of the rod coaetingwith the shoulder 36 of the dog 34 (Fig; 5) to stop rotation of theshaftin the same manner as the similar device shown in the Forbes patent referred to.

As so far described, the mechanism is not materially different from well-known structures butto aid an understanding of my improvement yet to be described I will briefly "explain the operation of the parts that have been referred'to' Assuming that the speed of rotation. of

the disk or pulley 18 is constant, anything;

which rocks the friction wheels 21 on their axes of adjustment will vary the speed. of

rotation transmitted. to the disk or wheel of speed is effected by means of. the lever 26 which acts through 'the liul: 25 to rock or oscillate the friction wheels 21 m a manner friction gear. 50 long as the clutch pin 32 is in position so that its operative end is interposed betweenthe two clutch studs 30, -the speed of rotation caused by the wheel 17 will be transmitted to the shaft. When position indicated in Fig. 5, there can be When the rod 4 1 per end co-acts' with the shoulder of the dog 34 to the shafts T will now describe theillustrated enipositively stop rotation of the clutch pin 32 is retracted. or is in the,

bodiment of my invention which renders it impossible to cause or effects stoppageof the shaft except when the lever 261s in such position as to hold the fricti'on'wheels 21 in positions to drive the wheel 17 at predetermined-m1n1murn 'speecf A fixed red 42 (see Fig. 2) having is; use i per end mounted in. the fixed bracket 41-0 and having-its lower .end secured in} any suitable manner. constitutes a guide for slide 43. said slide having. an arm 'la. 1- r 1. mid portion of the slide 43 .is' formed or lateral extension carrying a pin or r'oll 45 entering the space between the ribs lfifof lever 26. Consequently the vertical position of the slide 43 controls the position of theleyer 26 and the speed of rotation imparted to shaft 13.

Secured to the vertically movable rod 41 1s a hub 47 having. an arm 48 the head or 51 coiled about the pin is confined between the head 49 andarm 44. An elbow lever 52 is pivotally connected at 53 to one side of the slide 43, one arm of said elbow leverbeing provided with a hook or catch 54 adapted, as presently explained, to enthe upper edge of the hub 47. The

other arm 55 of the elbow lever projectsbelow the lower end of a pin 56 having a screw threaded portion 5? engaging a threaded opening in the fixed bracket 40, a nut 58 serving to secure an adjustment of thepin 56 after. such adjustment has once been made. A spring 59 connects the end.

of arm 44 of the slide with an arm 60 of the trame 14, said spring belng heavier or stronger than the spring 51- for. a reason presently explained" Aspiring 61 (see dotted lines 2) mounted in a socket in slide 43 is in engagement with the elbow lever 52 and operates it to engage the upper edge of the hub 47 and thus lock the slide 43 and rod 41 together, as will be explained below. In operation, assuming that theshatt has been stopped owing to the rod'41 being in the position shown in Fig. 5, but of course witlr thedriving pulley 18 acting through the shiftable friction wheels 21 to drive the wheel or disk 17, the operator then by actuating a treadleor othermeans to shift the rod 41 down below the path of rotation oi the dog, imparts such downward movement of the rod 41 as to release the stop and perniit the clutch'pin 32 to slide so that the shaft and wheel 17 will be conn cted and the shaft will be driven at the rate-oi speed which has been predetermined for the wheel 17. During this first downward'movement of he rod 41 no change of speed can occur because, although the hub 47 and its arm 48 move with the rod 41, there is no downward movement of the slide 43 which connects with the speed changing lever 26 simply be cause the spring 59 is sulliciently stronger than the springfil to hold the slide against downward movement until the llllllf''TIlhen this lowered far enough to bring "moves upwardly aga-inthe slide 43 will be locked with it, and' be positively carriedup' far (311011341110 act through lever 26 to bring the speed 01" shaft13'back to predetermined he pin 56. This' After-the lower end of the hub 47 contacts with the arm 44 of the slide 43-011- its downward movement, the downward movement of the rod 41 may be continued to enable the operator to run the machine at a very high speed for such length of time as he may desire, with no possibility oi the shaft being' stopped until tie driving speed has been reduced to the desired minimum as described. -When it is desired to return from excessive speed to normal, pressure on the treadle is relieved. so as to permit the rod 41 to rise, under the influence of the upward pull of the spring 59. After the rod 41 rises tar enoughto bring the arm 55 otthe elbow lever into contact with the adjusting pin 56, further movement causes the catch 54 to be automatically released from hub 47 and when the rod 41 and the slide 43 rise a little farther, as described below, the machine will be driven at minimum speed and no further upward movement oi the slide can occur. If the machine is to be stopped, the rod 41 is permitted to rise still further, under the influence oi the spring 51, until its upper end acts on the clutch dog (Fig. 5) to eill cct separation of the clutch members and stoppage oi the shaft.

The operation of the rod 41 and ol the slide 43 will now be explained in greater de tail. During the firstportion of downward movement of rod 41, spring 51 yields but spring 59 does not yield and no movement is imparted to slide 43 (and consequently no change of speed of shaft 13 occurs) until hub '471'eaches arm 44 after which, it the ,rod 41 continues down, spring 59 yields, the slide 43 moves down and acts through lever exert a lilting action on slide 43, said slide is only stopped when, with one arm of the elbow lever stillincontact, contact with pin '56 (due to the pressure of spring 61) the other arm is arrested bythe side, of the slide as shownin Fig.2. It the pin 56 is adjusted lower or 'higherthe disengagement of the catch 54 and the stoppage oi upward move ment of the slide will occur earlier or later in the period of upward movement otthe rod'41 and consequently said pin provides means for varyingthe point beyond which, during movement of rod 41 toward itsnnclutching and stopping; operation, no re duction'indriving speed can occur; In other words, by means of the adjustable pin 56 the Operator can easily and quickly vary the minimum speed at which the machine will venting operation of the stop when said de-' vices are positioned to give to the shaft any 7 speed exceeding a predetermined rate.

2. Mechanism for controlling the operation of a shaft comprising a clutch, means for positively stopping the shaft, devices which may be positioned in accordance with the varying speed requirements of a machine driven by the shaft to control the speed at which the shaft is driven by the clutch, and means for preventing operation of the stopping means when said devices are positioned to give to the shaft any speed exceeding a predetermined rate. r

3. Mechanism for controlling the operation of a shaft comprising a clutch, a stop for the shaft, devices which may be positioned in accordance with the varying speed requirements of a machine driven by the shaft to control the speed at which the shaft is driven by the clutch, and means for permitting operation of the stop only when said devlces are positioned to give to the shaft a predetermined minimum speed.

4. Mechanism for controlling the operation of a shaft, comprising a variable speed driver for the shaft, means for disconnecting the shaft from the driver and stopping it, and means for preventing theoperation of the shaft disconnecting means during rotation of the shaft'at a speed exceeding a predetermined rate. V

5. Mechanism for controlling the operation of a shaft comprising a clutch, a stop for the shaft, devices which may be positioned in accordance with the varying speed requirements of a machine driven by the shaft to control the speed at which the shaft is driven bythe clutch, means for permitting and preventing the operation of the stop,

= said means being controlledby'the position of said devices and means forvarying the pos t on at which SZtlCl devlces permit the operation of said stop;

6.' Mechanism for controlling the operation, of a shafticomprisinga clutch, a stop for the shaft, devices which may be positioned at the will of the operator to control the speed at which the shaft is driven by the clutch, means for; permitting and preventing said devices 7 prevent" disen.

the operation of the stop, said means being controlled by the position of'saiddevices and means for varying theposition atwhich prevent the operation of! said stop. 1

7i Mechanism for controlling the operation of a shaft comprising a clutch, a stop for .the shaft, devices which may be positioned at the will of the operator to control the speed at which the shaft isdriven by the clutch',"means for permitting and preventing the operation of the stop, saidv means being controlled by the position of said devices and means for varyingthe position at which said devices permit and prevent the operation of said stop. I

8. Mechanism for controlling the operation of a shaft comprising a clutch member fixed on the shaftya clutchmember loose upon the shaft, means for engaging and disengaging the two clutch members, devices which may be positioned at the will of the operator tocontrol the speed at which the loose clutch member is driven, and means for ensuring that said devices are positioned to give predetermined minimum speed to the loose-clutch member before said clutch members may be disengaged. V

9. Mechanism: for controlling the operation ofa shaftcomprising a clutch'member fixed on the shaft, a clutch[member loose upon the shaft, means for engaging and disengaging the two clutch members, devices which may be positioned at the will of the operator to control the speed at which the looseclutch memberis driven, and means for ensuring that said devices are positioned operator to control the spe'ed'at which the loose member is driven, andmeans for ensuringthat said devices are positionedto give apredetermined minimum speedtothe looseclutch member when the clutch memto ive a )redetermined minimum speed-to bers are brought into engagement and to ag'ement until said; devices are returned to said POSllZlOIl.

11." 'Mechanism for controlling the operation of a, shaft comprising a stop forrther shaft, a clutch member fixed on the shaft, a

members, devicesjwhich be positioned 1n accordance wlththe varying speed refclutch member loose upon "the shaft; means for engaging and disengaging-the two clutch I quirements of a machine driven by the shaft to control the speed at which the loose clutch member is driven, means for ensuring that V said. devices, are positioned to. give a prede-V termined minimum speed to the loose clutch member before said clutch members may be disengaged and the stop permitted to operate, and means for adjusting said devices to give the desired minimum of speed.

12. Mechanism for controlling the opera tion of a shaft, comprising-a variable speed driver having a clutch connection with the shaft, a slide and connections whereby the position of said slide controls the speed, a stop movable in the same direction as the slide, and means for automatically connecting and disconnecting the stop and slide at a point to prevent operation of the stop during rotation of the shaft at a speed exceeding a predetermined rate.

l3. A device of the character described having, in combination, a shaft, a variable speed driver having a clutch connection with the shaft, a stop for the shaft, a longitudinally movable rod for controlling the clutch and stop, a catch member adapted to be coupled to and disconnected from said rod whereby said catch member will be moved by the rod during a portion of the movement of the latter, and connections whereby the movements of the catch member will control the speed of the shaft.

14. Mechanism for controlling the operaac tion of a shaft comprising a shaft, a loose driving pulley, a loose clutch member, pivotally mounted friction devices to connect the loose driving pulley with the loose clutch member and drive the latter at any speed between a minimum and maximum, connections to position the friction devices at the will of theoperator, a clutch'member fixed to the shaft, a movable pin for connecting and disconnecting the two clutch members, a positive stop for the fixed clutch member, operator controlled means for controlling said pin and stop to start and stop the shaft, interlocking devices between the pin controlling means and the connections to the friction devices to prevent starting or stopping of the shaft except when the friction devices are positioned to drive the loose clutch member at the minimum speed and means to predetermine said minimum speed.

15. Mechanism for controlling the operation of a shaft comprising a clutch, means for positively stopping the shaft, devices which may be positioned to drive the shaft at any speed between a minimum and a maximum, means for adjusting said mini mum speed, and means for preventing operation of the stopping means when said devices are positioned to give to the shaft any speed except said minimum.

In testimony whereof I have signed my name to this specification.

PERLEY R. GLASS. 

